when I first start to drive my jeep after it has sat for a while it makes this wierd grinding/rattle sound. It doesn't sound good at all. I heard of flexplate bolts coming loose but i checked mine and they are tight, I also dont see any cracks at all on the flexplate. It also makes the sound when I go to turn it off, or if its under load (llike slowly going up a steep incline) it does it in all gears. I'm thinking its either something to do with the tranny or maybe an exhaust rattle but I just cant pinpoint it, mainly because to hear it I got to be driving.....

The jeep has a 4.5 inch rubicon lift and the 4.0 l engine

Any ideas???

Thanks

 

Have you checked the ujoints?

 

Is your tailpipe contacting your shackle? Or,
maybe your motor mounts or trans mounts are shot.
Can get some very strange noise/straining/vibes from that.

 

well I got it figured out, was my exauhst system, it is only connected at two points the very front by the cat, and at the very back by the tail pipe, I threw in another bracket just after the cat and now it sounds fine, no more grinding or rattles